CC load regulation
This test measures the change in output current resulting from a change in output voltage from full scale to short
circuit.
1.
Turn off the power supply using the AC line switch.
2.
Connect the power supply output with a DMM, an electronic load and a current shunt as shown below.
3.
Turn on the power supply using the AC line switch.
4.
Program the output voltage and output current as described in the test record form under CC load regulation.
5.
Enable the output by sending the command OUTP ON or by pressing the Output ON key.
6.
Operate the electronic load in constant voltage mode and set its voltage to the power supply output value as
described in the test record form under “CC Load Regulation”. See the
under Test Descrip-
tion of “CC Load Regulation” for details. Check that the front panel CC annunciator of the power supply remains
lit. If it turns to
CV
or
UR
, adjust the load so that the output current drops slightly until the CC annunciator
lights up. Record the current reading (Iload), by dividing the voltage reading on the DMM by the resistance of
the current monitoring resistor.
7.
Operate the electronic load in short (input short) mode. Record the current reading, (Ishort), by dividing the
voltage reading on the DMM by the resistance of the current monitoring resistor.
8.
Take the difference between the current readings in steps 6 and 7 is the load regulation current (Iload – Ishort).
The difference of the readings during the immediate change should be within the specification limits.
Keysight EDU36311A Service Guide
25
